and it's leading to new technologies. anybody who looks at the curiosity landing can see that we have just demonstrated how to land quite heavy pieces on mars. and that is now a very general thing that's going to be done for decades to come. you could land habitat modules, power plants, pressurized vehicles. you could start bringing down with this precision landing a bunch of pieces through separate missions. you don't have to have a gigantic rocket which brings everything at once which would be much more of a risk as well. so -- i forgot what the question was, but that was the important answer. [laughter] >> we were talking about justifying space travel. >> yeah. so you're seeing a capability developed that is very general. now, i think if you ask what would be the effect on our sense of pride and enthusiasm to have an american colony on mars, compare that to other sites. it's a matter of prioritization really. >> what about the rise of privately-funded space exploration? how do you see that playing out? >> extremely imp